Pump-rod guide and swab for well tubes



T. F. DAVIS Sept. 17, 1929.

PUMP ROD GUIDE AND SWAB FOR WELL TUBES Filed May .26, 1928 Patented Sept. 17, 1929 UNITED STATES THOMAS E. DAVIS, 01* ALMAQQKL HQMA PUMP-ROD GUIDE AND s WAB KOR'WELL TUBES,

Application filed May 26, 1928, s a 280,930

The invention relates to well tubes and particularly to tubes used in pumping oil in oil wells and has for its principal object the pro vision of improved means of removing paraffin and other deposit from the inner walls of the well tubes and also to provide means for guiding the pump rod.

A. further object of the invention is the provision of a swab for well tubing comprising a tube engaging member mounted on a tubular member to which hollow members are terminally secured, the end walls of the hollow members being perforated to permit passage of the oil or other pumped material through the swab, a valve being provided to prevent back flow of the pumped material, the device being constructed to permit extending the pump rod through the swab, the swab thereby forming a guide for the rod in the well tube, and the valve referred to forms an auxiliary valve for the pumping mechanisnn The invention will be described in detail hereinafter and will be found illustrated in,

the accompanying drawings, in which Figure 1 is a central vertical sectional view of a fragment of well tubing and pump rod,

showing the improved swab in position therm in, forming a guide for the pump rod, and

Figures 2 and 3 are transverse sectional views on planes indicated by the line 22 and 3 3, respectively, of Figure 1.

In the drawings similar reference characters are used to designate corresponding parts throughout the se veral views.

A well tube is shown at A in the three figures of the drawings, and B is the pump rod that is constructed, as usual, in section, haviug threaded nipples C on one of their ends to engage the threaded end D at the other ends of the sect-ions. A swab, which also forms a guide for the pumprod is mounted on one of the sections of the pump rod B as shown in Figure 1 of the drawings, and comprises a barrel-shaped member 1 that frictionally engages the inner walls of the tube A, and is supported on a tubular member 2. The tubular member 2 has externally threaded. portions 3 an d 4 and secured to said threaded. ends 3 and 4; are hollow members 5 and 6, respectively, that are in communication through the core of the tubular member 2. The extremities of the hollow members 5 and 6 are tapered or cone-shaped as shown at 7 and 8, respectively, and the apexes of said i tapered members 7 and 8 are provided with; openings 9 and 10, respectively, that slidably engage the pump rod that extends through the hollow members 5 and '6 and the connecting tubular member 2. The tapered end 7 is provided with openings Q and mounted on the' tapered end 7 is a tapered ring 1O that seats on the tapered end 7 to normally close said openings 9 Tapered end 8 is also provided with a plurality of openings 11. It will be understood that when the pump is in opera tion, the oil or other pumped material will enter the hollow member 6 through the open ings 1 1 and then through the bore of the tube 2 will pass into thehellow member 5 and from.

thence pass through the openings 9 lifting the tapered ring 10 to permit passage of the liquid, said ring 1O reseating on thetapered end 7 when the liquid pressure is relieved so that the swabstructure provides an auxiliary valve for the well pump. 7 f

12 indicates a flange or ring secured to the upper end of the hollow member 5 that serves to engage the ring 10 to limit its upward movement into open position. a I p i In use it will be apparent that the swab structure is lowered into the well by mounting it on a section ofthe pump rod B that will locate it in the well tubing where desired and when in position in the tubing, as heretofore stated, serves as a guide for the pump rod B, and also as a back pressure valve for the pumping apparatus, and the oil pumped above the swab will bedrawn from the tube when the pump rod B is drawn from the well and the oil will serve to soften the deposits on the well tube Aso that the member 1 will have frictional engagement with the inner walls of the tube to move the paraflin and other deposit from the well tube.

What is claimed is A. combined swab for well tubing and pump rod guide, comprising a well tubing engaging member, hollow cylindrical members ar ranged above and below said member, a tubular member extending through the well tubing engaging member, said tubular member being terminally threaded, the portions of said cylindrical members abutting the Well tubing engaging member provided with threaded openings to receive the threaded terminals of the tubular member, said tubular member providing communication between said cylindrical members, the remote ends of said hollow cylindrical members being tapered, said tapered ends of the cylindrical members being perforated, a tapered ring seated on the upper tapered end and forming a gravity seated valve to close the openings therein, a flange on the upper tapered end providing a stop to limit the movement of the ring into open position, and the extremities of said tapered ends provided with openings alined with the 1 bore of the tubular member to slidably receive a pump rod to space it from the Well tubing.

v4Q In testimony whereof I affix my signature.

THOMAS r1 DAVIS. 

